Lets think outside the box. if you need somewhere to pee. Why not carry a bucket to pee in that you can you use anywhere on your mighty craft, then dump it overboard. It also means you can have a proper A frame then.

What I have done is fix a 6 foot alloy tube from the seat back on the rib mounting the VHF Ariel on top and mounts for a A flag. Just ran the cabling down the inside of the tube and right into the consul, does the job OK. and a hell of a lot cheaper than a A frame. Well it is until the wife finds out what happened to the centre pole of here Rotary dryer

When I purchased my boat, it had been equipped with a mast about 6' tall, located in front of the transom and off to one side. It carried the antenna, and lights and had the advantage being lowerable (Is that a word?).

The boat had been owned by a police unit and they needed to be able to get under a low bridge at the end of their harbour...

I should add that they flipped this boat (5.9M), then flipped its successor (6.3M) and have finally replaced it with a 7.5M Hurricane with self-righting gear... I have come to believe that flipping RIBs was their standard way to upgrade a boat in the face of departmental budget cuts! Let the insurance pay for it...

The boat had been owned by a police unit and they needed to be able to get under a low bridge at the end of their harbour...

I should add that they flipped this boat (5.9M), then flipped its successor (6.3M) and have finally replaced it with a 7.5M Hurricane with self-righting gear... I have come to believe that flipping RIBs was their standard way to upgrade a boat in the face of departmental budget cuts! Let the insurance pay for it...

Well, hey; can't say they're all that stupid, I guess. Seems to be working for them.